"disengaging slog to level up the remaining four characters". Gies felt the "rigid and often frustrating" Quest mode led to playing the songs in an order that was "all over the place in terms of tone, difficulty, and most importantly, fun". Some reviewers felt the improved Quickplay+ mode to be the highlight of the game; Heppe noted that the mode "probably seems too basic to be the star of the game, but it really shines" while Minkley considered that it "offer[ed] a far stronger reason to replay than the embryonic Quest Mode manages". Gies' review of the Wii version noted that the Roadie Battles mode exclusive to the Wii version was enjoyable and "helps the Wii version of the game to stand tall" to the high-definition console version. Reviewers found the soundtrack to lack the focus that Activision claims it has, and that the series may have exhausted a number of good guitar songs in its previous iterations. Gies stated that the game soundtrack "may be the most uneven collection in any of the main Guitar Hero titles", citing problems with "a surplus of tracks that seem out of place", "too many songs that are just boring to play", and "a number of synth heavy songs that are nevertheless shoehorned" into the game. Official Xbox Magazine UK stated that the setlist "feels at times uninspired, incongruous and uninteresting". Helgeson felt the setlist was "a mixed bag", with a strong and balanced set of songs in the early tiers of Quest mode, while the latter, more difficult songs were "terrible and felt like a chore" to complete. Roger Hargreaves of The Metro commented that "with so many of the more iconic rock songs having already been used in previous Guitar Hero and Rock Band games developers are forced to use ever more obscure songs and/or acts". Heppe also considered the lack of iconic song, noting the setlist "seems like the same bands we always see in [Guitar Hero], just their 3rd tier hits". On the other hand, USA Todays Mike Snider claimed that the game's soundtrack "gave [him] a reason to blast music on [his] stereo", and besides providing well-known songs and bands, introduced him to new bands. Initial sales of Warriors of Rock were below estimates. NPD Group reported 86,000 units sold in the United States across all platforms for the last five days of September during which it was